EP3638501B2 - Device for micro-embossing of paper and paper processing line comprising said device - Google Patents
Device for micro-embossing of paper and paper processing line comprising said device Download PDFInfo
- Publication number
- EP3638501B2 EP3638501B2 EP18737992.0A EP18737992A EP3638501B2 EP 3638501 B2 EP3638501 B2 EP 3638501B2 EP 18737992 A EP18737992 A EP 18737992A EP 3638501 B2 EP3638501 B2 EP 3638501B2
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- EP
- European Patent Office
- Prior art keywords
- micro
- embossing
- paper
- cylinder
- ply
- Prior art date
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- 238000004049 embossing Methods 0.000 title claims description 156
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000009736 wetting Methods 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000005304 joining Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000005674 electromagnetic induction Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 230000009931 harmful effect Effects 0.000 description 3
- 239000006210 lotion Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011012 sanitization Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/07—Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H16/00—Unwinding, paying-out webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H18/00—Winding webs
- B65H18/08—Web-winding mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H37/00—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations
- B65H37/04—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations for securing together articles or webs, e.g. by adhesive, stitching or stapling
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/006—Making patterned paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0281—Wet presses in combination with a dryer roll
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/08—Pressure rolls
- D21F3/086—Pressure rolls having a grooved surface
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/02—Patterned paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F2201/00—Mechanical deformation of paper or cardboard without removing material
- B31F2201/07—Embossing
- B31F2201/0707—Embossing by tools working continuously
- B31F2201/0715—The tools being rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F2201/00—Mechanical deformation of paper or cardboard without removing material
- B31F2201/07—Embossing
- B31F2201/0707—Embossing by tools working continuously
- B31F2201/0715—The tools being rollers
- B31F2201/0741—Roller cooperating with a non-even counter roller
- B31F2201/0743—Roller cooperating with a non-even counter roller having a matching profile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F2201/00—Mechanical deformation of paper or cardboard without removing material
- B31F2201/07—Embossing
- B31F2201/0707—Embossing by tools working continuously
- B31F2201/0715—The tools being rollers
- B31F2201/0753—Roller supporting, positioning, driving means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F2201/00—Mechanical deformation of paper or cardboard without removing material
- B31F2201/07—Embossing
- B31F2201/0756—Characteristics of the incoming material, e.g. creped, embossed, corrugated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F2201/00—Mechanical deformation of paper or cardboard without removing material
- B31F2201/07—Embossing
- B31F2201/0771—Other aspects of the embossing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F2201/00—Mechanical deformation of paper or cardboard without removing material
- B31F2201/07—Embossing
- B31F2201/0782—Layout of the complete embossing machine, of the embossing line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F2201/00—Mechanical deformation of paper or cardboard without removing material
- B31F2201/07—Embossing
- B31F2201/0784—Auxiliary operations
Definitions
- the present invention relates to a device for the micro-embossing of paper, in particular "tissue” type paper, and a paper processing line comprising said device.
- micro-embossing means that the paper plies are embossed through a micro-embossing cylinder, and the related counter cylinder, which has reliefs substantially equally distributed on its side surface, where the reliefs have heights generally less than half a millimetre.
- Micro-embossing is therefore distinguished from traditional embossing in the general sense, which involves the performance, through embossing profiles, of embossings with greater heights and generally having patterns that also have an aesthetic effect.
- tissue paper obtained by subjecting one or more of the plies that comprise it to such a micro-embossing method allows the thickness of the paper itself to be increased, however also reducing the softness perceived by the final user.
- micro-embossing method mentioned above substantially envisages wetting, or humidifying, one or more paper plies before their embossing with a micro-embossing cylinder and then drying such plies to remove the residual water present, and thus obtaining a roll of micro-embossed paper generally comprising numerous plies, which can be subsequently used in "tissue” paper processing lines for obtaining the final product, such as so-called "converting" lines.
- Document JP 2015 074098 A discloses a micro-embossing device for tissue paper according to the preamble of claim 1.
- Document US 5 862 750 A discloses a method for impression microengravings, which reproduce holograms, kinetic holograms, or diffraction patterns, directly on paper through an embossing process.
- the main task of the present invention consists of realising a device for the micro-embossing of paper that overcomes the drawbacks of the prior art allowing the micro-embossing of the paper to be performed within the paper processing line itself.
- an object of the present invention is to realise a device for the micro-embossing of paper that can operate at micro-embossing speeds compatible with the production speeds of the paper processing lines.
- the main aim is to emboss the paper increasing its thickness considerably without deteriorating the characteristics of the paper itself (mechanical resistance and absorbency)
- Another object of the invention consists of realising a device for the micro-embossing of paper that allows the undesired production of paper dust to be reduced in a converting line.
- Yet another object of the invention consists of realising a device for the micro-embossing of paper that allows the paper to be wet with perfumed and/or sanitising lotions.
- a further object of the invention consists of realising a device for the micro-embossing of paper that can provide the widest reliability and safety guarantees during use.
- Yet another object of the invention consists of realising a device for the micro-embossing of paper that is both easy to realise and economically competitive compared with the prior art.
- the present invention also relates to a method for the micro-embossing of paper as set forth in claim 12.
- the device for the micro-embossing of paper comprises at least one micro-embossing unit 3 configured to micro-emboss a wet paper ply 5, 6.
- Such micro-embossing unit 3 comprises:
- the micro-embossing cylinder 7 comprises a side surface 13 partially wrapped by said wet paper ply 5, 6. Furthermore, the heating means 11 are configured to heat at least one portion 15 of said side surface 13 partially wrapped by the wet paper ply 5, 6 to dry such wet paper ply 5, 6.
- the micro-embossing unit 3 comprises at least one motorised return roller 19, 20 configured to ensure that the contact of the wet paper ply 5, 6 with the counter cylinder 17 occurs exclusively at the embossing area 9.
- the return roller 19, 20 allows the wet paper ply 5, 6 to enter into contact only tangentially with the counter cylinder 17.
- the side surface 13 of the micro-embossing cylinder 7 is advantageously wrapped by the wet paper ply 5, 6 over a wrapping angle ⁇ comprised between 120° and 300°, and preferably comprised between 180° and 270°.
- the side surface 13 of the micro-embossing cylinder 7 is wrapped by the wet paper ply 5, 6 over a wrapping angle ⁇ greater than 210°.
- the wrapping angle ⁇ of the wet paper ply 5 around the micro-embossing cylinder 7 is substantially equal to 270°.
- the heating means 11 can be housed inside the micro-embossing cylinder 7 and can therefore be configured to heat from within the side surface 13 of the micro-embossing cylinder 7.
- the heating means 11 can be housed outside the micro-embossing cylinder 7 and can therefore face the side surface 13 of the micro-embossing cylinder 7, heating the heated portion 15 thereof.
- Advantageously heating means can be provided acting both from inside and from outside the micro-embossing cylinder 7.
- the heating means 11 housed inside the micro-embossing cylinder 7 are advantageously adapted to heat, by conduction, the whole micro-embossing cylinder 7. Therefore, the whole portion of the wet paper ply 5, 6 that wraps the micro-embossing cylinder 7 is heated.
- the heating means 11 housed outside the micro-embossing cylinder 7 are advantageously adapted to heat, by radiation and/or convection, a portion 15 of the wet paper ply 5, 6 wrapped around the micro-embossing cylinder 7.
- the heat also tends to reach the micro-embossing cylinder 7, which tends to heat up and therefore to heat the wet paper ply 5, 6 which is wrapped around the micro-embossing cylinder 7 itself. Therefore, the heating of the wet paper ply 5, 6 does not necessarily take place exclusively at the heated portions 15 thereof that face the heating means 11.
- the heating means 11 can comprise an electrical resistor, appropriately embedded in the micro-embossing cylinder 7, or an oil, water or steam heating circuit, also at least partially obtained inside the micro-embossing cylinder 7 itself.
- the micro-embossing cylinder 7 is a steel micro-embossing cylinder.
- a coil can be inserted into the micro-embossing cylinder 7 inside which oil circulates at a controlled temperature, supplied by a pumping and heating system, which can also reside outside the device 1.
- the heating means 11 can comprise an electromagnetic induction heater 112.
- the heating means 11 can comprise a hood 110 conveying a flow of hot air onto the heated portion 15 of the side surface 13 of the micro-embossing cylinder 7.
- the hood 110 affects a sufficiently extended surface area of the side surface 13 of the micro-embossing cylinder 7, to ensure sufficient delivery of heat to dry the wet paper ply 5, 6.
- the hood 110 can affect an angular surface of the embossing cylinder 7 according to an angle comprised between 30° and 270°, and preferably about 180°.
- the device for the micro-embossing of paper 1 comprises a plurality of said micro-embossing units 3 adapted to operate in parallel.
- figures 1 and 5 illustrate devices for micro-embossing 1 that comprise two micro-embossing units 3 reciprocally superposed and configured to micro-emboss two distinct wet paper plies 5 and 6 in parallel.
- the counter cylinder 17 is a rubber counter cylinder. Such counter cylinder 17 is configured tc press, at the embossing area 9, against a micro-embossing cylinder 7 in order to micro-emboss the wet paper ply 5, 6 which is interposed between the cylinder 7 and the counter cylinder 17.
- the counter cylinder 17 may be associated with a mechanism 170 adapted to vary the distance of the centre of the counter cylinder 17 from the centre of the micro-embossing cylinder 7, both to move the counter cylinder 17 away from the cylinder 7, as illustrated by way of example in figure 2 , and to vary the co-penetration between the rubber counter cylinder 17 and the micro-embossing cylinder 7.
- the counter cylinder 17 comprises on its side surface a plurality of incisions 170 configured for coupling with the micro-embossing reliefs 70 present on the micro-embossing cylinder 7, according to a male/female coupling.
- the counter cylinder 17 is activated in rotation in a synchronised way with the rotation of the micro-embossing cylinder 7.
- the counter cylinder 17 is activated in rotation through gears that draw the rotation motion from the micro-embossing cylinder 7.
- the micro-embossing unit 3 comprises a plurality of return rollers 19, 20 arranged around the counter cylinder 17 to prevent contact of the wet paper ply 5, 6 with the counter cylinder 17 except at the embossing area 9.
- a single return roller 19 may be sufficient, such as in the example of figure 5 or, as illustrated in the example of figure 1 , to prevent contact of the paper ply 5, 6 with the counter cylinder 17, the individual return roller indicated with the reference number 19 in proximity to the embossing area 9 may not be sufficient, and therefore further embossing rollers must be provided indicated with the reference number 20.
- all the return rollers 19, 20 can be motorised.
- At least one return roller 19, or all the return rollers 19, 20 present are motorised rollers further reduces the risks of the wet paper ply 5, 6 undergoing undesired stretching in the path towards the device 1, up to the embossing area 9.
- the micro-embossing cylinder 7 has a plurality of reliefs substantially equally distributed around the lateral surface 13 of the cylinder 7 itself, where such reliefs have a thickness of less than 1 millimetre, and preferably less than 0.5 millimetres.
- reliefs can be truncated pyramid shaped or have a truncated cone shaped section.
- the number of reliefs present on the micro-embossing cylinder can be advantageously comprised between 60 and 100 reliefs per square centimetre.
- the axes of rotation of the micro-embossing cylinder 7 and the counter cylinder 17, respectively, lie in the same substantially horizontal plane.
- the horizontal arrangement of the cylinder 7 and the counter cylinder 17 advantageously allows the vertical dimensions of the device 1 to be reduced.
- the present invention also relates to a paper processing line 100, or a converting line, comprising:
- the paper plies 51, 61 can be unwound, in the unwinding station 105, starting from a pair of single ply rolls or starting from a double ply roll.
- the wetting station 101 may comprise any wetting unit 111 able to wet the paper plies 51, 61.
- a nozzle system or a dosing roller system may be provided.
- the wetting unit 111 is configured to wet the face of the paper ply 51, 61 which is intended to face the micro-embossing cylinder 7.
- the joining station 107 may comprise a laminating unit adapted to join the paper plies 50, 60.
- the join between the two paper plies 50, 60 may be performed with mechanical systems, such as ply bonding systems.
- the wetting station 101 and the micro-embossing station 103 can be deactivated.
- the paper plies follow the envisaged paper passage but are not wet by the wetting unit 111 and are neither micro-embossed by the micro-embossing cylinder 7, e.g. by moving away the counter cylinder 17, nor heated.
- all the necessary operations for reaching the final product can be performed, in line, starting from a paper with multiple plies, of which at least one of the plies has been micro-embossed with the micro-embossing device as described.
- the plies at the outlet from the device 1 can be supplied to a traditional embossing station, if present, or directly reach the rewinding station 109.
- the present invention also relates to a method for the micro-embossing of paper comprising the steps of:
- the method comprises the steps of:
- the device for the micro-embossing of paper according to the present invention has the advantage of being able to micro-emboss, and particularly dry, the wet paper plies effectively even at high production speeds, such as production speeds in the order of 500 metres per minute and up to 900 metres per minute.
- the wet paper ply that has just been embossed remains in contact with the heating element, such as the micro-embossing cylinder itself, for a sufficiently long time to allow the drying of the ply itself, but without reducing the processing speed of the paper.
- the time during which the wet paper ply remains in contact with the heating element depends on the size of the wrapping of paper around the micro-embossing cylinder that is heated. The greater the extension of such wrapping, the greater the processing speed that can be ensured while maintaining the efficiency of the drying process of the wet paper ply just embossed.
- the micro-embossing device allows the paper to be micro-embossed at compatible production speeds with the paper processing speeds in the converting lines, and therefore it can be inserted directly in the converting line itself.
- Yet another advantage of the invention consists of the fact that the wet paper ply is heated, and therefore dried, as soon as the micro-embossing has been performed, preventing the risks of the just embossed paper, that is still wet, being able to lose the micro-embossing effect.
- the device for the micro-embossing of paper as conceived herein is susceptible to many modifications and variations, all falling within the invention; furthermore, all the details are replaceable by technically equivalent elements.
- the materials used, as well as their dimensions, can be of any type according to the technical requirements.
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- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Paper (AREA)
Description
- The present invention relates to a device for the micro-embossing of paper, in particular "tissue" type paper, and a paper processing line comprising said device.
- It is currently known, for example from patent no.
EP1731296B1 , that rolls of "tissue" type paper are made through a method of micro-embossing paper plies that have been previously wet or onto which a lotion with a wetting effect has been previously applied. The term micro-embossing means that the paper plies are embossed through a micro-embossing cylinder, and the related counter cylinder, which has reliefs substantially equally distributed on its side surface, where the reliefs have heights generally less than half a millimetre. Micro-embossing is therefore distinguished from traditional embossing in the general sense, which involves the performance, through embossing profiles, of embossings with greater heights and generally having patterns that also have an aesthetic effect. - It has been found that the "tissue" paper obtained by subjecting one or more of the plies that comprise it to such a micro-embossing method allows the thickness of the paper itself to be increased, however also reducing the softness perceived by the final user.
- The micro-embossing method mentioned above substantially envisages wetting, or humidifying, one or more paper plies before their embossing with a micro-embossing cylinder and then drying such plies to remove the residual water present, and thus obtaining a roll of micro-embossed paper generally comprising numerous plies, which can be subsequently used in "tissue" paper processing lines for obtaining the final product, such as so-called "converting" lines.
- However, the micro-embossing method mentioned above, and described in patent no.
EP1731296B1 , has significant technical drawbacks mainly connected with the complexity and slowness of the operations to be performed in order to reach, starting from one or more paper plies, the formation of rolls of "tissue" paper having the desired resistance and softness properties, and therefore the final product that can be obtained starting from such rolls. - Document
JP 2015 074098 A claim 1. - Document
US 5 862 750 A discloses a method for impression microengravings, which reproduce holograms, kinetic holograms, or diffraction patterns, directly on paper through an embossing process. - The main task of the present invention consists of realising a device for the micro-embossing of paper that overcomes the drawbacks of the prior art allowing the micro-embossing of the paper to be performed within the paper processing line itself.
- Within the context of this task, an object of the present invention is to realise a device for the micro-embossing of paper that can operate at micro-embossing speeds compatible with the production speeds of the paper processing lines.
- The main aim is to emboss the paper increasing its thickness considerably without deteriorating the characteristics of the paper itself (mechanical resistance and absorbency)
- Another object of the invention consists of realising a device for the micro-embossing of paper that allows the undesired production of paper dust to be reduced in a converting line.
- Yet another object of the invention consists of realising a device for the micro-embossing of paper that allows the paper to be wet with perfumed and/or sanitising lotions.
- A further object of the invention consists of realising a device for the micro-embossing of paper that can provide the widest reliability and safety guarantees during use.
- Yet another object of the invention consists of realising a device for the micro-embossing of paper that is both easy to realise and economically competitive compared with the prior art.
- The task set forth above, as well as the mentioned objects and others that will appear more clearly below, are reached by a device for the micro-embossing of paper as set forth in
claim 1. - The present invention also relates to a method for the micro-embossing of paper as set forth in claim 12.
- Other characteristics are envisaged in the dependent claims.
- Additional features and advantages will become more apparent from the description of a preferred, but non-exclusive, embodiment of a device for the micro-embossing of paper, illustrated by way of non-limiting example with the aid of the appended drawings, in which:
-
figure 1 is a schematic view of a part of a paper processing line that comprises a device for the micro-embossing of paper, according to the invention; -
figure 2 is a schematic view of a device for the micro-embossing of paper, according to the invention; -
figures 3 and 4 relate to two variants of the device for the micro-embossing of paper offigure 2 , and schematically illustrate the main components of such two variants, according to the invention; -
figure 5 is a schematic view of a part of a paper processing line that comprises a device for the micro-embossing of paper, in a further variant, according to the invention; -
figure 6 schematically illustrates a detail of the processing cylinders according to a further variant of the device for the micro-embossing of paper, according to the invention. - With reference to the mentioned figures, the device for the micro-embossing of paper, indicated overall with the
reference number 1, comprises at least onemicro-embossing unit 3 configured to micro-emboss awet paper ply micro-embossing unit 3 comprises: - a
micro-embossing cylinder 7 and acounter cylinder 17 facing themicro-embossing cylinder 7 at anembossing area 9 where suchwet paper ply - heating means 11 configured to dry the
wet paper ply - According to the invention, the
micro-embossing cylinder 7 comprises aside surface 13 partially wrapped by saidwet paper ply portion 15 of saidside surface 13 partially wrapped by thewet paper ply wet paper ply - The
micro-embossing unit 3 comprises at least onemotorised return roller wet paper ply counter cylinder 17 occurs exclusively at theembossing area 9. - Advantageously the
return roller wet paper ply counter cylinder 17. - The
side surface 13 of themicro-embossing cylinder 7 is advantageously wrapped by thewet paper ply - Advantageously the
side surface 13 of themicro-embossing cylinder 7 is wrapped by thewet paper ply - For example, as illustrated in
figures 2 ,3 and 4 , the wrapping angle α of thewet paper ply 5 around themicro-embossing cylinder 7 is substantially equal to 270°. - The heating means 11 can be housed inside the
micro-embossing cylinder 7 and can therefore be configured to heat from within theside surface 13 of themicro-embossing cylinder 7. - Alternatively, the heating means 11 can be housed outside the
micro-embossing cylinder 7 and can therefore face theside surface 13 of themicro-embossing cylinder 7, heating the heatedportion 15 thereof. - Advantageously heating means can be provided acting both from inside and from outside the
micro-embossing cylinder 7. - The heating means 11 housed inside the
micro-embossing cylinder 7 are advantageously adapted to heat, by conduction, the wholemicro-embossing cylinder 7. Therefore, the whole portion of thewet paper ply micro-embossing cylinder 7 is heated. - The heating means 11 housed outside the
micro-embossing cylinder 7 are advantageously adapted to heat, by radiation and/or convection, aportion 15 of thewet paper ply micro-embossing cylinder 7. However, also in this case, the heat also tends to reach themicro-embossing cylinder 7, which tends to heat up and therefore to heat thewet paper ply micro-embossing cylinder 7 itself. Therefore, the heating of thewet paper ply heated portions 15 thereof that face the heating means 11. - The heating means 11 can comprise an electrical resistor, appropriately embedded in the
micro-embossing cylinder 7, or an oil, water or steam heating circuit, also at least partially obtained inside themicro-embossing cylinder 7 itself. - The
micro-embossing cylinder 7 is a steel micro-embossing cylinder. - A coil can be inserted into the
micro-embossing cylinder 7 inside which oil circulates at a controlled temperature, supplied by a pumping and heating system, which can also reside outside thedevice 1. - As illustrated schematically in
figure 3 , the heating means 11 can comprise anelectromagnetic induction heater 112. - As illustrated schematically in
figure 2 , the heating means 11 can comprise ahood 110 conveying a flow of hot air onto the heatedportion 15 of theside surface 13 of themicro-embossing cylinder 7. Advantageously thehood 110 affects a sufficiently extended surface area of theside surface 13 of themicro-embossing cylinder 7, to ensure sufficient delivery of heat to dry thewet paper ply - For example, the
hood 110 can affect an angular surface of the embossingcylinder 7 according to an angle comprised between 30° and 270°, and preferably about 180°. - Advantageously, the device for the micro-embossing of
paper 1 comprises a plurality of saidmicro-embossing units 3 adapted to operate in parallel. - For example,
figures 1 and5 illustrate devices for micro-embossing 1 that comprise twomicro-embossing units 3 reciprocally superposed and configured to micro-emboss two distinctwet paper plies - The
counter cylinder 17 is a rubber counter cylinder.Such counter cylinder 17 is configured tc press, at theembossing area 9, against amicro-embossing cylinder 7 in order to micro-emboss thewet paper ply cylinder 7 and thecounter cylinder 17. - The
counter cylinder 17 may be associated with amechanism 170 adapted to vary the distance of the centre of thecounter cylinder 17 from the centre of themicro-embossing cylinder 7, both to move thecounter cylinder 17 away from thecylinder 7, as illustrated by way of example infigure 2 , and to vary the co-penetration between therubber counter cylinder 17 and themicro-embossing cylinder 7. - Advantageously, as schematically illustrated in the enlargement shown in
figure 6 , thecounter cylinder 17 comprises on its side surface a plurality ofincisions 170 configured for coupling with themicro-embossing reliefs 70 present on themicro-embossing cylinder 7, according to a male/female coupling. - Advantageously, the
counter cylinder 17 is activated in rotation in a synchronised way with the rotation of themicro-embossing cylinder 7. - Advantageously, the
counter cylinder 17 is activated in rotation through gears that draw the rotation motion from themicro-embossing cylinder 7. - The presence of male/female incisions/reliefs between the
steel micro-embossing cylinder 7 and therubber counter cylinder 17, allows the embossing pressure to be reduced between thecylinder 7 and thecounter cylinder 17 which, in the case of wet and heated paper, notably reduces the harmful effects caused by traditional embossing. - Advantageously, the
micro-embossing unit 3 comprises a plurality ofreturn rollers counter cylinder 17 to prevent contact of thewet paper ply counter cylinder 17 except at theembossing area 9. - According to the path performed by the paper ply, and according to the arrangement of the
micro-embossing cylinder 7 and the counter cylinder 17 asingle return roller 19 may be sufficient, such as in the example offigure 5 or, as illustrated in the example offigure 1 , to prevent contact of thepaper ply counter cylinder 17, the individual return roller indicated with thereference number 19 in proximity to theembossing area 9 may not be sufficient, and therefore further embossing rollers must be provided indicated with thereference number 20. - It has been observed that the rubber cylinders, co-penetrating into steel micro-embossing cylinders in the reciprocal contact point tend to assume a lower rotation speed than the steel cylinder itself. In the event that the paper ply is partially wrapped around the rubber cylinder, such difference in speed between the two cylinders implies the elongation and therefore the stretching of the paper ply, with a consequent thinning of the thickness of the paper ply. Such a phenomenon is even more accentuated the greater the rotation speed of the two cylinders. Such stretching of the paper ply is particularly harmful for the paper that has just been humidified and it is in a very easily deformable state.
- Therefore the presence of
return rollers wet paper ply counter cylinder 17 except in the point of contact with themicro-embossing cylinder 17, in theembossing area 9, drastically reduces such a harmful effect on the wet paper. - Advantageously, all the
return rollers - The fact that at least one
return roller 19, or all thereturn rollers wet paper ply device 1, up to theembossing area 9. - Advantageously, the
micro-embossing cylinder 7 has a plurality of reliefs substantially equally distributed around thelateral surface 13 of thecylinder 7 itself, where such reliefs have a thickness of less than 1 millimetre, and preferably less than 0.5 millimetres. - Advantageously such reliefs can be truncated pyramid shaped or have a truncated cone shaped section. The number of reliefs present on the micro-embossing cylinder can be advantageously comprised between 60 and 100 reliefs per square centimetre.
- According to the invention, the axes of rotation of the
micro-embossing cylinder 7 and thecounter cylinder 17, respectively, lie in the same substantially horizontal plane. The horizontal arrangement of thecylinder 7 and thecounter cylinder 17 advantageously allows the vertical dimensions of thedevice 1 to be reduced. - In this way, it is possible to vertically superpose two or more devices for the micro-embossing of
paper 1. - The present invention also relates to a
paper processing line 100, or a converting line, comprising: - an
unwinding station 105 for unwinding at least two paper plies 51, 61; - a wetting
station 101 for wetting at least one of such two paper plies 51, 61, adapted to wet said at least onepaper ply 51, 61 to obtain at least onewet paper ply - a
micro-embossing station 103 for micro-embossing said at least onewet paper ply paper 1 as described above, adapted to micro-emboss said at least onewet paper ply micro-embossed paper ply - a joining station 107 for joining said at least one
micro-embossed paper ply micro-embossed paper ply paper ply 51, 61, to obtain a paper with multiple plies at least one of which is micro-embossed; - a rewinding station 109 for rewinding such multi-ply paper, for forming a roll of paper known as a "log".
- Advantageously the paper plies 51, 61 can be unwound, in the
unwinding station 105, starting from a pair of single ply rolls or starting from a double ply roll. - The wetting
station 101 may comprise any wettingunit 111 able to wet the paper plies 51, 61. - For example, a nozzle system or a dosing roller system may be provided.
- Advantageously the wetting
unit 111 is configured to wet the face of thepaper ply 51, 61 which is intended to face themicro-embossing cylinder 7. - Advantageously, the wetting
station 105 can provide further systems for the application of perfumed and/or sanitizing lotions. - The joining station 107 may comprise a laminating unit adapted to join the paper plies 50, 60. Alternatively to the use of glue, the join between the two paper plies 50, 60 may be performed with mechanical systems, such as ply bonding systems.
- Advantageously, in the event that the paper plies are not to be micro-embossed, the wetting
station 101 and themicro-embossing station 103 can be deactivated. In this case the paper plies follow the envisaged paper passage but are not wet by the wettingunit 111 and are neither micro-embossed by themicro-embossing cylinder 7, e.g. by moving away thecounter cylinder 17, nor heated. - Advantageously, it is possible to deactivate the wetting
station 101 only, as well as the heating means 11, in order to perform a traditional type of micro-embossing, i.e. dry. - In the rewinding station 109 all the necessary operations for reaching the final product can be performed, in line, starting from a paper with multiple plies, of which at least one of the plies has been micro-embossed with the micro-embossing device as described.
- The plies at the outlet from the
device 1 can be supplied to a traditional embossing station, if present, or directly reach the rewinding station 109. - The present invention also relates to a method for the micro-embossing of paper comprising the steps of:
- wetting at least one
paper ply 51, 61 to obtain at least onewet paper ply - embossing said at least one
wet paper ply steel micro-embossing cylinder 7 and arubber counter cylinder 17 in anembossing area 9; - heating said at least one
wet paper ply wet paper ply - According to the invention, the method comprises the steps of:
- at least partially wrapping said at least one
wet paper ply side surface 13 of thesteel micro-embossing cylinder 7 over a wrapping angle α comprised between 120° and 300°; - heating at least one
portion 15 of theside surface 13 partially wrapped by saidwet paper ply wet paper ply - returning said at least one
wet paper ply motorised return roller wet paper ply counter cylinder 17 occurs exclusively at saidembossing area 9. - The device for the micro-embossing of paper according to the present invention has the advantage of being able to micro-emboss, and particularly dry, the wet paper plies effectively even at high production speeds, such as production speeds in the order of 500 metres per minute and up to 900 metres per minute.
- In particular, the wet paper ply that has just been embossed remains in contact with the heating element, such as the micro-embossing cylinder itself, for a sufficiently long time to allow the drying of the ply itself, but without reducing the processing speed of the paper. In fact, the time during which the wet paper ply remains in contact with the heating element depends on the size of the wrapping of paper around the micro-embossing cylinder that is heated. The greater the extension of such wrapping, the greater the processing speed that can be ensured while maintaining the efficiency of the drying process of the wet paper ply just embossed.
- In particular, the micro-embossing device allows the paper to be micro-embossed at compatible production speeds with the paper processing speeds in the converting lines, and therefore it can be inserted directly in the converting line itself.
- In this way it is possible to directly equip the converting lines of such a micro-embossing device directly, without necessarily having to provide a specific micro-embossing device for the realisation of rolls of micro-embossed paper to be processed in the converting lines.
- Yet another advantage of the invention consists of the fact that the wet paper ply is heated, and therefore dried, as soon as the micro-embossing has been performed, preventing the risks of the just embossed paper, that is still wet, being able to lose the micro-embossing effect.
- The device for the micro-embossing of paper as conceived herein is susceptible to many modifications and variations, all falling within the invention; furthermore, all the details are replaceable by technically equivalent elements. In practice, the materials used, as well as their dimensions, can be of any type according to the technical requirements.
Claims (12)
- Device for the micro-embossing of paper (1) comprising at least one micro-embossing unit (3) configured to micro-emboss a wet paper ply (5, 6), said micro-embossing unit (3) comprising:- a steel micro-embossing cylinder (7) and a rubber counter cylinder (17) facing said micro-embossing cylinder (7) at an embossing area (9) where said wet paper ply (5, 6) is subjected to micro-embossing, and- heating means (11) configured to dry said wet paper ply (5, 6),said steel micro-embossing cylinder (7) comprises a side surface (13) partially wrapped by said wet paper ply (5, 6) over a wrapping angle (α) comprised between 120° and 300°, and in that said heating means (11) are configured to heat at least one portion (15) of said side surface (13) partially wrapped by said wet paper ply (5, 6) to dry said wet paper ply (5, 6),characterised in that the axes of rotation of said micro-embossing cylinder (7) and said counter cylinder (17) lie in a same substantially horizontal plane and said at least one micro-embossing unit (3) comprises at least one motorised return roller (19, 20), configured to ensure that the contact of said at least one wet paper ply (5, 6) with said rubber counter cylinder (17) occurs exclusively at said embossing area (9).
- Device for the micro-embossing of paper (1), according to claim 1, characterised in that said side surface (13) is wrapped by said wet paper ply (5, 6) over a wrapping angle (α) comprised between 180° and 270°.
- Device for the micro-embossing of paper (1), according to claim 1, characterised in that said side surface (13) is wrapped by said wet paper ply (5, 6) over a wrapping angle (α) greater than 210°.
- Device for the micro-embossing of paper (1), according to one or more of the preceding claims, characterised in that said heating means (11) are housed inside said micro-embossing cylinder (7) and are configured to heat from within said side surface (13) of said micro-embossing cylinder (7).
- Device for the micro-embossing of paper (1), according to one or more of the claims from 1 to 4, characterised in that said heating means (11) are housed outside said micro-embossing cylinder (7) and face said side surface (13) of said micro-embossing cylinder (7) to heat said heated portion (15) of said side surface (13) partially wrapped by said wet paper ply (5, 6).
- Device for the micro-embossing of paper (1), according to one or more of the preceding claims, characterised in that said heating means (11) comprise an electrical resistor, or an oil, water or steam heating system, or an electromagnetic induction heater (112), or a hood (110) conveying a flow of hot air.
- Device for the micro-embossing of paper (1), according to one or more of the preceding claims, characterised in that it comprises a plurality of said micro-embossing units (3) adapted to operate in parallel.
- Device for the micro-embossing of paper (1), according to one or more of the preceding claims, characterised in that said counter cylinder (17) comprises on its side surface a plurality of incisions configured to be coupled to the micro-embossing reliefs present on said micro-embossing cylinder (7).
- Device for the micro-embossing of paper (1), according to one or more of the preceding claims, characterised in that said counter cylinder (17) is activated in rotation in a synchronised way with the rotation of said micro-embossing cylinder (7).
- Device for the micro-embossing of paper (1), according to one or more of the preceding claims, characterised in that said counter cylinder (17) is activated in rotation by means of gears that draw the rotation motion from said micro-embossing cylinder (7).
- Paper processing line (100) comprising:- an unwinding station (105) for unwinding at least two paper plies (51, 61);- a wetting station (101) for wetting at least one of said at least two paper plies (51, 61), adapted to wet said at least one paper ply (51, 61) to obtain at least one wet paper ply (5, 6);- a micro-embossing station (103) for micro-embossing said at least one wet paper ply (5, 6), comprising a device for the micro-embossing of paper (1) according to one or more of the preceding claims, adapted to micro-emboss said at least one wet paper ply (5, 6) to obtain at least one micro-embossed paper ply (50, 60) ;- a joining station (107) for joining said at least one micro-embossed paper ply (50, 60) with a second micro-embossed paper ply (50, 60) or with said at least one paper ply (51, 61), to obtain a paper with multiple plies at least one of which is micro-embossed;- a rewinding station (109) for rewinding said multi-ply paper.
- Method for the micro-embossing of paper comprising the steps of:- wetting at least one paper ply (51, 61) to obtain at least one wet paper ply (5, 6);- embossing said at least one wet paper ply (5, 6) between one steel micro-embossing cylinder (7) and a rubber counter cylinder (17) in an embossing area (9),- heating said at least one wet paper ply (5, 6) to dry said at least one wet paper ply (5, 6);characterised in that it comprises the steps of:- providing the micro-embossing cylinder (7) and the counter cylinder (17) with axis of rotation on a same substantially horizontal plane;- at least partially wrapping said at least one wet paper ply (5, 6) around the side surface (13) of said steel micro-embossing cylinder (7) over a wrapping angle (α) comprised between 120° and 300°;- heating at least one portion (15) of said side surface (13) partially wrapped by said wet paper ply (5, 6) to dry said wet paper ply (5, 6)- returning said at least one wet paper ply (5, 6) by means of at least one motorised return roller (19, 20)to ensure that the contact of said at least one wet paper ply (5, 6) with said counter cylinder (17) occurs exclusively at said embossing area (9).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL18737992T PL3638501T3 (en) | 2017-06-14 | 2018-06-13 | Device for micro-embossing of paper and paper processing line comprising said device |
RS20211029A RS62241B1 (en) | 2017-06-14 | 2018-06-13 | Device for micro-embossing of paper and paper processing line comprising said device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102017000065732A IT201700065732A1 (en) | 2017-06-14 | 2017-06-14 | DEVICE FOR PAPER MICRO-EMBOSSING AND LINE FOR PAPER PROCESSING INCLUDING THIS DEVICE. |
PCT/IB2018/054311 WO2018229676A1 (en) | 2017-06-14 | 2018-06-13 | Device for micro-embossing of paper and paper processing line comprising said device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3638501A1 EP3638501A1 (en) | 2020-04-22 |
EP3638501B1 EP3638501B1 (en) | 2021-05-26 |
EP3638501B2 true EP3638501B2 (en) | 2024-05-22 |
Family
ID=60138798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18737992.0A Active EP3638501B2 (en) | 2017-06-14 | 2018-06-13 | Device for micro-embossing of paper and paper processing line comprising said device |
Country Status (10)
Country | Link |
---|---|
US (1) | US11628645B2 (en) |
EP (1) | EP3638501B2 (en) |
JP (1) | JP2020523226A (en) |
CN (1) | CN110914048B (en) |
CA (1) | CA3066574A1 (en) |
ES (1) | ES2886371T3 (en) |
IT (1) | IT201700065732A1 (en) |
PL (1) | PL3638501T3 (en) |
RS (1) | RS62241B1 (en) |
WO (1) | WO2018229676A1 (en) |
Families Citing this family (5)
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US11654650B2 (en) | 2019-06-05 | 2023-05-23 | GAMBINI S.p.A. | Embossing and lamination assembly and relative embossing and lamination method |
CN115666921A (en) * | 2020-04-10 | 2023-01-31 | 科尔伯纸巾股份公司 | Machine and method for embossing a web product |
CA3179906A1 (en) * | 2020-04-10 | 2021-10-14 | Korber Tissue S.p.A. | Method and device for heating an embossing roller in an embossing-laminating device |
IT202000022513A1 (en) | 2020-09-24 | 2022-03-24 | Paper Converting Machine Company S P A | METHOD AND EQUIPMENT FOR THE PRODUCTION OF TISSUE PAPER PRODUCTS INCLUDING AT LEAST ONE EMBOSSED PLY |
IT202100017675A1 (en) | 2021-07-05 | 2023-01-05 | Koerber Tissue S P A | EMBOSSING DEVICE WITH AT LEAST ONE HEATED EMBOSSING ROLLER, AND METHOD |
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- 2018-06-13 JP JP2019568610A patent/JP2020523226A/en active Pending
- 2018-06-13 ES ES18737992T patent/ES2886371T3/en active Active
- 2018-06-13 WO PCT/IB2018/054311 patent/WO2018229676A1/en unknown
- 2018-06-13 PL PL18737992T patent/PL3638501T3/en unknown
- 2018-06-13 EP EP18737992.0A patent/EP3638501B2/en active Active
- 2018-06-13 CA CA3066574A patent/CA3066574A1/en active Pending
- 2018-06-13 CN CN201880039668.3A patent/CN110914048B/en active Active
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Also Published As
Publication number | Publication date |
---|---|
CN110914048B (en) | 2021-08-17 |
JP2020523226A (en) | 2020-08-06 |
CA3066574A1 (en) | 2018-12-20 |
CN110914048A (en) | 2020-03-24 |
EP3638501B1 (en) | 2021-05-26 |
IT201700065732A1 (en) | 2018-12-14 |
BR112019025928A2 (en) | 2020-06-30 |
US11628645B2 (en) | 2023-04-18 |
EP3638501A1 (en) | 2020-04-22 |
RS62241B1 (en) | 2021-09-30 |
WO2018229676A1 (en) | 2018-12-20 |
US20200324506A1 (en) | 2020-10-15 |
ES2886371T3 (en) | 2021-12-17 |
PL3638501T3 (en) | 2021-11-22 |
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